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Php constants – It is like variable.
After define it cant be change.
Constant start with letter or underscore.
It cant be change during the script.
Use with define() function.
<!DOCTYPE html>
<html>
<head>
<title>constants example</title>
</head>
<body>
define(name, value, case-insensitive)
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title>constants sensitive</title>
</head>
<body>
<?php
define("HELLO", "Welcome to tutorialfamily.com!");
echo HELLO;
?>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title>constants insensitive</title>
</head>
<body>
<?php
define("HELLO", "Welcome to tutorialfamily.com!", true);
echo hello;
?>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title>constants array</title>
</head>
<body>
<?php
define("cars", [
"Toyota",
"Oddi",
"Hero"
]);
echo cars[0];
?>
</body>
</html>
